It is not possible to locate the exact position of an electron, but the electron cloud shows the region where an electron is most likely to be. When the plastic strip is rubbed on the skin, electrons ...

It also tells us that chlorine has 18 neutrons (35 - 17) and, as the number of electrons and protons are equal in a neutral atom, chlorine also has 17 electrons. The relative mass of a nucleus is ...

The atomic number of a sodium atom is 11 and its mass number is 23. Calculate the number of protons, neutrons and electrons it contains.

It's made up of a central nucleus consisting of protons and neutrons, called nucleons, with electrons orbiting around ...